Hi. Your team's hard work is greatly appreciated in documenting the history of the PBR MK.1 and the heroic sailors who manned them. If it would be of any use to you, below is a link to a 1/35 scale resin kit manufactured by Masterpiece Models. I believe their work is very well researched. They produce several kits of Brown Water Navy boats including a Mk.1 PBR, a PCF Swift Boat, Monitors, ASPB, and a PACV Hovercraft. The PBR pdf. instruction file has many images of the boat details, including the Mk.17 forward gun mount. I hope you can find their website informative and interesting.. Again, many thanks to all of you for dedicating so much time and effort to the 1/6 scale PBR Mk.1 project.
Best regards,
Pete Bruno
https://masterpiecemodels.com/product/31-patrol-boat-river/
Also on Facebook - Masterpiece Models